Arimayama Ryūemon

was a Japanese sumo wrestler from , Settsu Province (now Nishinomiya, Hyōgo Prefecture). His highest rank was ōzeki. He is the first wrestler from Hyōgo Prefecture to have been promoted to this rank and the last until the promotion of Ōnaruto II in 1890, 69 years later.

Career Iwamigata began his professional wrestling career by joining the Osaka-based sumo association, and was taken under the eldership of Onogawa. In 1808 he joined the association based in Edo and wrestled under the teachings of former maegashira , who ran the eponymous stable. In 1871 he adopted the shikona, or ring name. In November 1813, he was promoted to sumo's highest division, makuuchi. Upon promotion he received the patronage of the Matsue Domain.

In 1818, he was promoted to the rank of sekiwake and tried to change his shikona to Onogawa to evoke his former master in Osaka. However, he was not allowed to use this name by the Hizen-Arima clan, who were Onogawa's patrons and who had moral authority over the name "Onogawa", and by the Yoshida family, who argued that the Onogawa shikona could only belong to a wrestler who had obtained a yokozuna licence. Instead of Onogawa, he finally adopted the shikona and was transferred under the authority of the Nanbu clan.

During his career, he showed solid results but never managed to win the equivalent of a championship, failing in particular at the first tournament in 1819 against Kashiwado Risuke who, being better ranked than Iwamigata at the time, won the tournament with the same number of victories as Iwamigata, as was customary at the time. Iwamigata also failed twice more against Kashiwado in the first tournaments of 1820 and 1822. Despite the fact that he never managed to win the equivalent of a tournament, Iwamigata was promoted to ōzeki for the last tournament in 1821, because Tamagaki failed to enroll in that tournament. He held the rank of ōzeki for two tournaments before being demoted back to sekiwake in October 1822. After his demotion, he took his definitive shikona of Iwamigata. He retired in January 1824.

Nine years after his retirement, he remained in the sumo association as an elder under the name Onogawa, becoming the sixth generation of this coaching name. He died on 8 February 1835.

Iwamigata is the protagonist of the poem , recounting his struggles to acquire the name of his former master. Championships for the best record in a tournament were not recognized or awarded before the 1909 summer tournament and the above championships that are labelled "unofficial" are historically conferred. For more information see yūshō.